diff options
Diffstat (limited to 'apps/plugins/lib')
| -rw-r--r-- | apps/plugins/lib/grey_core.c | 50 |
1 files changed, 21 insertions, 29 deletions
diff --git a/apps/plugins/lib/grey_core.c b/apps/plugins/lib/grey_core.c index 1326599..143d09a 100644 --- a/apps/plugins/lib/grey_core.c +++ b/apps/plugins/lib/grey_core.c @@ -253,41 +253,33 @@ static void invert_gvalues(void) unsigned x = 0; unsigned last_x; - if (_grey_info.flags & GREY_BUFFERED) - { - fill_gvalues(); - grey_update(); - } - else /* Unbuffered - need crude reconstruction */ + /* Step 1: Calculate a transposed table for undoing the old mapping */ + for (i = 0; i < 256; i++) { - /* Step 1: Calculate a transposed table for undoing the old mapping */ - for (i = 0; i < 256; i++) + last_x = x; + x = _grey_info.gvalue[i]; + if (x > last_x) { - last_x = x; - x = _grey_info.gvalue[i]; - if (x > last_x) - { - rev_tab[last_x++] = (last_i + i) / 2; - while (x > last_x) - rev_tab[last_x++] = i; - last_i = i; - } + rev_tab[last_x++] = (last_i + i) / 2; + while (x > last_x) + rev_tab[last_x++] = i; + last_i = i; } - rev_tab[last_x++] = (last_i + 255) / 2; - while (256 > last_x) - rev_tab[last_x++] = 255; + } + rev_tab[last_x++] = (last_i + 255) / 2; + while (256 > last_x) + rev_tab[last_x++] = 255; - /* Step 2: Calculate new mapping */ - fill_gvalues(); + /* Step 2: Calculate new mapping */ + fill_gvalues(); - /* Step 3: Transpose all pixel values */ - val = _grey_info.values; - end = val + _GREY_MULUQ(_grey_info.width, _grey_info.height); + /* Step 3: Transpose all pixel values */ + val = _grey_info.values; + end = val + _GREY_MULUQ(_grey_info.width, _grey_info.height); - do - *val = _grey_info.gvalue[rev_tab[*val]]; - while (++val < end); - } + do + *val = _grey_info.gvalue[rev_tab[*val]]; + while (++val < end); } #endif |